ALS tower white needle guide is shuddering and sticking when entering sample and wash vials

My G2913A ALS tower appears to have a problem with the white needle guide and is shuddering when entering sample and wash vials, and the white needle guide is staying at the barrel end of the needle and slowly sliding down it when the needle retracts up into the tower. This began after having an error with the needle plunger being stuck and needing a replacement needle. Can the plunger and the needle seat/guide post get out of sync with each other somehow?

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0 garyb007 7 months ago

Try taking the syringe out and running it and see if it stops. The needle guide is a solid piece that is just pushed down by a spring. Maybe the spring is worn out. Do you have another tower you could try swapping it with? Still I don't know why it is shuddering. Maybe the syringe motor is bad. You can send it in for repair and get a loaner to use.
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0 garyb007 7 months ago

Try taking the syringe out and running it and see if it stops. The needle guide is a solid piece that is just pushed down by a spring. Maybe the spring is worn out. Do you have another tower you could try swapping it with? Still I don't know why it is shuddering. Maybe the syringe motor is bad. You can send it in for repair and get a loaner to use.
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